multiply box intersection normal by invTranspose instead of transform

NuofanXu · Sep 23, 2020 · f4acc04 · f4acc04
1 parent 63ef6d5
commit f4acc04
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/intersections.h b/src/intersections.h
@@ -83,7 +83,7 @@ __host__ __device__ float boxIntersectionTest(Geom box, Ray r,
             outside = false;
         }
         intersectionPoint = multiplyMV(box.transform, glm::vec4(getPointOnRay(q, tmin), 1.0f));
-        normal = glm::normalize(multiplyMV(box.transform, glm::vec4(tmin_n, 0.0f)));
+        normal = glm::normalize(multiplyMV(box.invTranspose, glm::vec4(tmin_n, 0.0f)));
         return glm::length(r.origin - intersectionPoint);
     }
     return -1;